Indented paper



Sept. 4, 1934. w. H. ELLIS, JR

INDENTED PAPER Original Filed Dec. 19. 1930 V M A EQEQLWQAEQ QEQIEQU QMA . I INVENTOR. I rMzL/AM H154 us, JR.

ATTORNEYS,

Reiasucd Sept; 4,1934

UNITED STATES mm mm was. a. am, In, Glendale, Ohio' Original No. 1,863,973, data! June 21,1932, Serial No. 503,517, December 19, 1930. Application for nine June 18, 1934, Serial No. 731,159

g '4 Claims. (c|.' 154451 My invention relates to indented paper which is combined in more than one layer to form a. composite sheet of excellent insulating and cushioning properties and very low in cost of 'ingre dients and mode of manufacture.

The usual material employed in the arts for partitions between, and protection of fragile articles, and generally wherever it is desired to employ P per board for insulating or cushioning, is

formed of one or more layers of corrugated paper pasted toflat sheetsknownasfacing. This type of materialisknownin the tradeascorrugatedboard, either single or double faced or doubledouble,asmay be. v

The operations for making corrugated paper require careful control and cannot be up beyond certain quite definite limits. It requires expensive machinery and is a dimeult operation to paste the facing sheet or sheets thereto. Fur thermore, the material used (termed the furnish) must contain definite proportions of expensive fiber to meet the physical requirements of taking the corrugations and retain strength or rigidity suflicient for good cushioning qualities.

Indented paper, on the other hand, can be made of a cheap furnish consisting largely of waste papers, the indentations or protuberance: being imparted to the sheet in the procas of original formation ofthe fibers, and hence having a flrm,

set, or rigid fiber structure at origin. The operations of pastingsheets thereof together can he very rapid, and the machinery used is inexpensive and easy of control, as will be shown herewith.

indented paper, instead of beim provided with regular transverse corrugations, is formed with small protuberances and indentations. The patternsusedin the-artareofvarioussizesand shapes, but in any one sheet the pattern must be regular. It is the object of my invention to paste one or more sheets of indented paper together. I have found it to be impractical to attempt to paste two like sheets together, and avoid nesting of the indentations and protuberances. Thus, two sheets of indented paper made on the same pattern will be such that the pi'otuherances on one sheet will seat in the indent tions of the other, unless a very exact relationship can be during pasting. This relationship cannot be at practical operating speeds on a machine. Accordingly, I employ in-my invention sheets of indented paper which do not have the same pattern impressed into them, or if I I use sheets which have the same pattern, I turn one sheet at right angles to the other before pasting, which results practically in the same thing as using two sheets of different pattern.

I prefer to employ indentation patterns in allternate sheets which are arranged not tcnest with 30 each other, and run long sheets of the several different kinds of paper through a continuous pasting operation. To this end I provide indented webs of which one sheet will have the indentations and protuherances close to each other lat- 55 erally of the sheet, and the other sheet will have them close together lengthwise of the sheet.

With such an arrangement, no projection on the one sheet will flt into an indentation on the other.

I may, however, employ any two indented sheets 7 a which will not, as a result of lengthwise or lateral shifting during the pasting operation, nest together, whereby the completed pastedsheet will have a maximum cross section which is sub stantially equal to the sumv of the maximum cross 7 sections of the pieces making them up, whether or not the sheets maintain exactly the same relation to each other during pasting.

I have illustrated and will describe one particular mode of accomplishing my invention, and so will append to the.ensuing specification thereof, certain claims which'set forth the invention inherent therein.

In the drawing:-

Figure 1 is a; di ram of a Pasting machin 'used in pasting two sheets of indented paper together.

Figure 2 isa plan view of one sheet of indented paper.

Figure 3 is a plan view showing another piece of indented paper with the sheet'shown in Figure 2 underlying the same.

Figure 4 is a section on the line 4-4 of Figure 3. I

The sheet of indented paper shown in Figure 2 is typical of the modern small sized indentation paper. It has, regarding the sheet from the top,

a series of indentations having bases 1, and a series of protuberances having crests 2. Such indentations are made with rolls having their surfaces cut to form a series of projecting flat topped or rounded topped pins,the pins of one roll arranged or timed so as to mesh between the pins of the other roll during the indenting opm5 eration which is incident to passing a soft sheet of paper between them.

The walls 02 the protuberances which are preferably somewhat rounded, are indicated at 3, and the walls of the indentations which are also no preferably somewhat rounded, are indicated at 4. The important characteristic is the arch-like formation in cross section.

It will be noted oithis sheet that the projections and indentations are arranged in rows crosswise of the sheet, resulting in crosswise rows of deformations, with the main body of the sheet, as indicated at 9, interspacing the rows.

Referring to Figure 3, the topmost sheet is oppositely arranged to the sheet of Figure 2. In this instance the bases oi the indentations are indicated at 5, and the crests of the protuberances at 6. The side walls of the protuberances are indicated at 7, and the side walls of the indentations are indicated at 8. second sheet, it will be observed that there are rows of deformations lengthwise oi the sheet, with the undeformed portion of the paper at 10 between the rows. Also, the maximum dimensions of the deformations in each sheet is in the direction of the rows.

When two such sheets-of paper are placed on indentations extending in the crosswise direction. In other words, the protuberances of one sheet will remain in substantially offset relation transversely of the plane oi the combined sheets from the indentation in the opposing sheet. Thus, I am able to paste two such sheets together without danger of any nesting, and in spite of irregularities in the sheets, due to stretching unequally or displacements in the pastor, I'will always obtain in the pasted product a sheet which has a maximum thickness equal to the thickness of the two sheets plus the thickness of the paste layer, whatever it may be, due to the non-nesting or oiiset position of the two sheets.

It will be evident to those skilled in the art that indentations of different patterns Irom those just described may be used to accomplish the stated object. -It will also be noted that the two patterns I have shown can be arranged for by taking two sheets which are exactly alike and turning one at right angles to the other.

It will also be evident thatlfor a three or more ply sheet, the alternate ones will have to be of different indentation pattern.

In Figure 1 I have indicated a simple pasting machine for uniting the webs. I have there indicated two rolls 11 and 12 which will be of patterns which will not mesh. One of the webs passes over a glue roll 13 and meets the other webs between the soft squeeze rolls 14. Both webs then pass between two groups of pressure guide rolls 15 and 16.

Suitable felts 17 and 18 pass around the squeeze rolls and the remainder oi the pasting machine, and carry the two united sheets between them. The felts and the two sheets which have a layer of glue or paste between them, pass around the two heated drying rolls 19 and'2o, and the intermediate rolls 21, 22, and 23. After passing over the roll 23, the two felts are guided back over series of idlers 24 and 25, and the pasted sheets may then be rolled up into the rolls 26 or else passed out over a drying table, following which they may be rolled or cut into sections.

This pasting operation is obviously very simpl In the case of this.

and the mechanism used quite inexpensive. I 11- Y lustrate it merely to show one way of uniting the sheets together, since any desired method is consistent with my invention. Thus, the sheets may be united by bands of adhesive instead of a complete coating, and then cut into pads on the glue lines.

Having thus described one particular embodiment of my invention and illustrated a mechanism for carrying out the same, what I claim as novel in the article produced, and desire to cover by Letters Patent, is:-

1. An indented paper board composed of two or more layers of indented paper or paper board combined with adhesiveQand each layer having numerous small alternating, pressure resisting indentations and protuberances archlike in any cross section and of such size and/or shape that the protuberances oi the one sheet will be substantially in offset relation with the indentations of the adjacent sheet or sheets, whereby the composite thickness throughout the sheet is substantially equal to the sum of the thicknesses oi the individual sheets. Y

2. An indented paper board composed of two or more layers of indented paper or paper board combined with adhesive, and each layer having numerous small alternating, pressure resisting indentations and protuberances archlike inv any I stantially in ofl'set relation with the indentations of the adjacent sheet or sheets, whereby the comberances and indentations cannot practically be regulated, said layers combined with adhesive,

and the indentations of opposing layers so shaped that the protuberances of one sheet have at least one dimension greater than the like dimension of the indentations or the opposing sheet whereby the composite over all thickness of the combined sheets is substantially equal to the sum of the thicknesses. of the individual sheets.

4. An indented paper board composed of two or more layers of paper orpaper board having indentations therein alternating with protuberances both of such small size that in a combining operation the relative positions of opposing protuberances and indentations cannot practically be regulated, said layers combined by superfin posing one on the other, and the indentations of opposing layers so shaped that the protuberances of one sheet have at least one dimension greater than the like dimension oi the indentations of theopposing sheet whereby the composite over all thickness of the combined sheets is substantially equal to the sum of the thicknesses of the individual sheets. WILLIAM H. ELLIS, JR. 

